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Characterization of YBa2Cu3O7−δ thin films deposited by dc magnetron sputtering

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Abstract

It was found from plan-view transmission electron microscopy (TEM) observations that c-oriented YBa2Cu3O7−δ (YBCO) films on LaAlO3, prepared by the magnetron sputtering technique had a single crystalline-like YBCO matrix, but always contained some precipitates of impurity phases. A large number of highly defective twin boundaries were also observed in all of these epitaxial films. Such highly defective twin boundaries are thought to be flux pinning centres and also paths for the diffusion of water into YBCO films. Therefore the films need to be passivated against attack from humid air.

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Author notes

  1. Yupu Li

    Present address: Texas Center for Superconductivity, University of Houston, 77204-5932, Houston, Texas, USA

  2. F. M. Saba

    Present address: Materials and Device Research Laboratory III, Toshiba Research and Development Centre, 1 Komukai Toshiba-cho, Saiwaiku, 210, Kawasaki, Japan

Authors and Affiliations

  1. Centre for High Temperature Superconductivity, Imperial College of Science Technology and Medicine, SW7 2BP, London, UK

    Yupu Li, J. A. Kilner, J. Thomas, D. Lacey, L. F. Cohen, A. D. Caplin, Y. H. Li & F. M. Saba

  2. National Physical Laboratory, TW11 0LW, Teddington, Middlesex, UK

    P. G. Quincey

  3. Department of Materials Science and Metallurgy, University of Cambridge, CB2 3QZ, Cambridge, UK

    R. E. Somekh

  4. Department of Electronic and Electrical Engineering, University of Surrey, GU2 5XH, Guildford, Surrey, UK

    C. Jeynes & Z. H. Jafri

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  1. Yupu Li
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  2. J. A. Kilner
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  4. D. Lacey
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Li, Y., Kilner, J.A., Thomas, J. et al. Characterization of YBa2Cu3O7−δ thin films deposited by dc magnetron sputtering. JOURNAL OF MATERIALS SCIENCE 31, 6137–6144 (1996). https://doi.org/10.1007/BF00354430

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